Triple action power press



Aug. 9,

Fild June 9. 1930 2 Sheets-Sheet l datum S 9, 1932- A. SEIDEL ET AL 1,871,938

' TRIPLE ACTION POWER PRESS Filed June 9. 1950 2. sheets-sheet 2 INNER UPPER PL UN GER gwmntoz GWOl MQQ Patented Aug. 9, 1932 UNITED STATES PATENT OFFICE .ADOLPH SEIDEL MEREDITH B. HATCH, OF TOLEDO, OHIO, ASSIGNOBS TO THE TO I LEDO MACHINE & TOOL COMPANY, OF TOLEDO, OHIO, A. CORBOBATION OF OHIO TRIBLE ACTION POWER" PRESS Application filed June 9, 1930. Serial No. 459,896.

This invention relates to power presses of the type-having differentially operated workholding and shaping parts, and particularly to the means employed for operating said parts.

A primary object of the invention is th provision of a press of this character having three relatively movable work-coacting parts, in the present instance a blank-holder, an upper plunger and a lower plunger, and having a simple and efficient unitary operating means for imparting the requisite movements and dwell to the respective parts.

Other objects and advantages of the invention will be apparent from the following detailed description thereof.-

While the invention in its broader aspect is capable of embodiment in numerous forms, oneembodiment thereof is illustrated in the accompanying drawings, in which Figure l is a front elevation of a press embodying the invention, with the parts in normal or at rest position and with the dies removed;

Fig. 2 is a side elevation thereof;

Fig. 3 is an enlarged section taken from, front to rear centrally through the bed and wor'k-coacting parts with the latter in engagementwith a work piece and at the limit of their respective work-gripping and shaping movements; and 4 Fig. 4 is a motion diagram of the work-' coact-ing'parts.

Referring to the drawings, 1 designates the press frame which includes the two spaced uprights 1 connected at their tops by the top or crown piece 1", near their lower ends by the bed 1, and at their lower ends by the bottom piece 1. The top piece 1 has a vertical opening therethrough to permit the mounting of operating parts therein, as hereinafter described, and the frame sides have feet or laterally projecting portions 1 for mounting on a floor or other suitable supporting means for the press.

The customary blank-holder 2 is mounted above the bed 1 for vertical reciprocatory movements between guides::3 secured to the respective frame sides 1 and ja vertical opening therethrough in which the upper plunger 4 is mounted for'vertical reciprocatory movements. The lower plunger 5 of the press is mounted for vertical reciprocatory movements in the bed 51 and carries a.

die 6 adapted to work up through a lower '5 die 7 on the bed 1 and to cooperate with the plunger 5 to communicate reciprocatory, 5

movements thereto from a revolution of the crank.

, The ends of the crank-shaft project outwardly beyond the bearings '13 therefor in the frame sides and each has a gear14 fixed To thereto and dapted to be driven by-a pinion 14 that is c nnected to any suitable source of power, not shown, as is common or well understood in the ar In the dpress illustrated, the control means II is omitte as such means constitutes no part of the present invention. Gontrols for power presses, however, are common in the art and y it will be understood that any suitable control may be used in connection with the means 80 employed for imparting rotation to the crank-shaft so that such crank-shaft may be stopped at the end of each cycle of operations or may, be run continuously if it is desired to operate the press as a repeater; 85"

A suitable controlfor the purpose is shown in Patent N 0. 1,600,403 dated September 21, 1926.

. The blank-holder operating means in the present instance includes, at each side of so the press, a pitman or connectingbar 15, attached at its lower end to a crank or eccentric pin 16 on the outer side of the respective gear 14-. and at its upper end to a slide .block 17 mounted for vertical reciprocatory 95 movements at the outer side of the respective frame upright 1 between guides 18 secured thereto. Each block 17 at its upper end is connected by links'19 to an associated pair of rocker-arms 20, intermediate their 9 ends, said arms being mounted at their outer ends on pivot studs 21 projecting from the press frame above and at opposite sides of the connected block 17, and having their inner ends projecting inwardly over the block and connected by respective links 22 to respective rocker-arms 23, projecting in wardl at the same side of the frame from rock-shafts 24.

The shafts 24 are two in number, being mounted respectively in the front and rear portions of the frame at the top thereof and parallel to the crank-shaft axis. The arms 23 are carried by the outer extended ends of the shafts 24, at the respectiue side of the frame, and each shaft is provided intermediate its ends above the blank-holder 1 with a pair of corresponding outwardly projecting rocker-arms 25, each of which is con nected with the adjacent corner of the blankholder by a respective link 26. The links 26 and their respective arms 25 form toggle connections between the blank-holder and the respective rock shaft, and the connection between the rock-shafts and slide block 17 is such that when the block is at the limit of its down stroke said toggle connections are in broken position to hold the blankholder in elevated position, and when the slide blocks are raised, a lowering workengaging movement is imparted to the blankholder.

The operating means for the upper plunger 4 comprises, at each side of the press, an cecentric 27 mounted on the respective end of the crank-shaft 10 between the gear 14 and frame side, and this eccentric is connected by a strap and connecting bar 28 to the lower end of a vertically movable slide bar 29, which extends upward at the inner side of the slide block 17 and has its upper and lower end portions coacting with guides 30 and 31, respectively, secured to the frame side above and below the slide block 17, and diroot the vertical movements of the bar 29.

The upper end of the bar 29 is connected by a link 32 to the outwardly projecting end of a lever 33, the fulcrum pin 34 of which is mounted in the adjacent side of the top piece 1 with its axis transverse to that of the rock-shafts 24. The lever 33 is of straight form and projects through a side opening in the top piece 1 of the frame. The free end of the inner arm of the lever 33 is connected by a link 35 to a rocker-arm 36 mounted on a pivot 37 and the free end of this rocker without its point of connection with the link 35 is connected by a link 38 to the upstanding arm of a bell-crank lever 39, mounted on a pivot 40 in the top piece 1 with its axis transverse to that of the rock-shafts 24. The other arm of the lever 39 extends inwardly toward the center of the frame and is connected by a link 41 to the central portion of the adjacent end of the upper plunger 4, said link and the connected arm of the lever 39 00* operating to form a toggle connection between the plunger 4 and plvot 40. The inner end of the lever 33-and the parts connecting it with the link 40 are disposed withm the hollow of the top piece 1 at the respective side of the frame and the arrangement and connection of these parts is substantially as illustrated in Fig. 1. It will be understood that the connection just described between the crank-shaft 10 and one end of the plunger is duplicated at the opposite side of the frame for the other end of the plunger.

It will be noted that the operating connections between the crank-shaft 10 and the blank-holder 2 and plunger 4 are such that upward movements of the respective slide parts 17 and 29 impart lowering movements "to the blank-holder and plunger and also that the movements of the lower plunger 5 are opposed to the simultaneous movements of the upper plunger and blank-holder, thus causing the operating parts of the press to have a balanced action. It will also be noted that the blank-holder and upper and lower plungers are all operated from the main crank-shaft of the press and that the connections between the crank-shaft and both the blank-holder and the upper plunger are such as to cause the blank-holder and upper plunger te lower substantially to ether with the blank-holder first engaging t e work and the two members then having a prolonged dwell while the lower plunger is performing its work, as illustrated by the motion diagram in Fig. 4.

It is apparent in the operation of the press, and particularly by reference to the diagram in Fig. 4, that during a cycle of operations the blank-holder first starts on its down stroke and is then immediately followed by the upper plunger, the two then continuing downward at approximately the same speed, with the blank-holder first engaging the work so as to hold it firmly at its edges while the plunger and its die are effecting a predetermined shaping of the work piece. The blankholder and upper plunger then have a prolonged dwell during which period the lower plunger with its die imparts a predetermined upward shaping of the work piece and then recedes from the work, after which the blankholder and upper plunger move upward to at rest position.

It is found in practice that the arrangement of operating parts for the three work-engaging parts, substantially as shown and described, produces a triple action press which is balanced in its action and highly efficient in its operation.

I wish it understood that the invention is not restricted to any particular form or arrangement of the arts but that it is capable of numerous modi cations and changes without departing from the spirit of the claims.

between said shaft and each of said plungersand blank-holder to impart predetermined reciprocatory movements thereto and to cause the blank-holder and upper plunger to dwell in engagement with a blank and during the blank-shaping movement of the lower plunger.

, 2. In a power press, a frame having a bed therein, a blank-holder and an upper plunger mounted in the frame above the bed, a lower plunger mounted in the frame for movements through the bed, a crank-shaft mounted in the lower portion of the frame, connection between said crank-shaft and lower plunger, and separate driving connections between said shaft at each side of the frame and said blank-holder and upper plunger for operating the same, said plungers having opposed movements and said blank-holder and upper plunger having a dwell in engagement with the blank during the blank-shaping, action of the lower plunger.

3. In a power press, a frame, a lower plunger, an upper plunger, and a blank-holder mounted in said frame, a crank-shaft mounted in the frame, crank and pitman connection between said shaft and the lower plunger, and separate connections between said shaft and the other plunger and said blank-holder for reciprocating the same from a rotation of the shaft and causing them to dwell in blank-engaging position during the blank-shaping movement of the other plunger, said last-mentioned connections each having rocking parts, with the axes of the rocking parts of one parallel ,to the crank shaft axis, and with the axes of the. rocking parts of the other transverse to the crank-shaft axis.

4. In a power press, a frame, a lower plunger, an upper plunger, and a blank-holder mounted in said frame, a crank shaft mount ed inthe frame, crank and pitman connection between said shaft and the lower plunger, and separate connections between said shaft and the other plunger and said blank-holder for reciprocating the same from a rotation of the shaft and causing them to dwell in blank-engaging position during the blank-shaping movement of the other plunger, the connection with said blank-holder having rocking parts, the axes of which are parallel to those of the crank-shaft.

5. In a power press, a frame, a lower plunger, an upper plunger, and a blank-holder mounted in said frame, a crank-shaft mounted in the frame, crank and pitman connection between said shaft and the lower plunger, and separate connections between said shaft and the other plunger and said blank holder for reciprocating the same from a rotation of the shaft and causing them to dwell in. blank-engaging position during the blankshaping movement of the other plunger, the connection with said upper plunger having rocking parts, the rocking axes of which are transverse to the axis of said shaft.

6. In a power press, a frame, a lower plunger, an upper plunger, anda blank-holder mounted in said frame, a crank-shaft mounted in the frame, crank and pitman connection between said shaft and the lower plunger, and separate connections between said shaft and the other plunger and said blank-holder for reciprocating the same from a rotation of the shaft and causing them to dwell in'blankengaging position during the blank-shaping movement of the other plunger,'the connection with said-blank holder having rocking parts, the rocking axes of which are parallel to said shaft and the connection with said upper plunger having rocking parts, the rocking axes of which are transverse to said shaft.

7. In a powerpress,'a frame, upper and lower plungers and a blank-holder mounted in said frame, a crank-shaft mounted in the frame, connection between said shaft and one of said plungers to operate the same, and separate connections between said shaft and .said other plunger and blank-holder for operating the same and causing them to dwell in blank-engaging position during the blankshaping movement of the other plunger, said last-mentioned connections each having slide parts mounted for parallel sliding movements on a side of the frame with said parts having connection at one end with the crank shaft and at their other ends with the respecTtive blank-holder and plunger.

8. In a power press, a frame, upper and lower plungers and a blank-holder mounted insaid frame, a crank-shaft mounted in the frame, connection between said shaft. and one of said plungers to operate the same, and separate connections between saidshaft and said other plunger and blank-holder for'op crating the same and causing them to dwell in "blank-engaging position during the blankshaping movement of the other plunger, said last-mentioned connections each having slide parts-mounted for parallel sliding movements ona side of the frame with said parts having per" plunger and a blank-holder mounted in said frame above'ythe bed, a crank shaft mounted in the frame below the bed, connece while the upper plunger remains stationary tion between said shaft and lower plunger to and acts as a blank holder. I v

In testimony whereof we have hereunto shaft, and separate mechanisms connecting signed our names to this specification.

operate the same, a wheel at each end of said opposite sides of said wheels to said upper plunger and blank-holder for imparting predetermined differential reciprocatory movements thereto when said wheels are rotated.

10. In a power press, a frame, a crank shaft mounted in the lower portion of the frame, means for driving said shaft and including a gear on each end thereof, upper and lower plungers and a blank-holder mounted for relative reciprocatory movements in said frame, a pitman connection between said shaft and the lower of said plungers and separate connections between each of said gears and said upper plunger and blank- .holder for imparting predetermined differential movements thereto from a rotation of the gears, one of said connections being operated from one side of each of said gears and having rock shafts parallel to the crank shaft, and the other of said connections being operated from the opposite side of each of said gears and having rock shafts with their axes transverse to the crank shaft axis.

11. In a power press, a frame having a bed, a blank-holder opposed to the bed, upper and lower opposed plungers, a driven shaft, and ,means operable successively by said shaft first to lower the blank-holder, and then to lower the upper plunger, then to raise and lower the lower plunger whilethe blank-holder and upper plunger remain stationary, and then to return the blankholder and the upper plunger to their initial positions.

. 12. In a power press, a frame having a bed, a blank-holder opposed to the bed, upper and lower opposed plungers, a driven shaft, crank, pitman and toggle connections between said shaft andthe blank-holder for re ciprocating the latter with a dwell in its movement, other crank, pitman and toggle connections between said shaft and the upper plunger for reciprocating the latter with a shorter dwell in its movement, and crank and pitm'an connections between said shaft andthe lower plunger to raise and lower the latter during the dwell in the movements of the upper plunger and blank-holder.

13. In a power press, a frame having a bed,

a lower plunger reciprocable through the bed,

a blank holder opposed to the bed, an upper plunger opposed to the bed and the lower plunger, means for moving said blank holder to engage the blank and hold it against'said bed, means for then moving the upper plunger against the blank first to shape it and then to 'hold it between the upper plunger and bed while said blank holder remains stationary, and means for then reciprocating the lower plunger through the bed to engage the blank and complete the shaping thereof by a reciprocatory motionv ADOLPH SEIDEL. 

